We're dividing 3803963 by 15 
Let's see how many times 15 fits into 3803963.

Let's proceed to step 1:
If we divide 3 by 15, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (8) from the dividend after 3, then repeat: 38 / 15

On to step 2:
If we divide 38 by 15, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 30 from 38 leaves us with 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 15

Let's proceed to step 3:
When dividing 80 by 15, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 25.0
Subtract 75 from 80 to get 5.
Fetch the next digit (3) from the dividend, attach it to 5 and continue: 53 / 15

Moving on to step 4:
The number 15 fits into 53 3 times, leaving a remainder of 8.
Use 3 as the next digit of our solution. 
Result so far: 253.0
Subtracting 45 from 53 leaves us with 8.
Append the next digit (9) from the dividend to 8 and continue with: 89 / 15

On to step 5:
If we divide 89 by 15, we get 5 and a remainder of 14.
Use 5 as the next digit of our solution. 
Result so far: 2535.0
Subtract 75 from 89 to get 14.
Fetch the next digit (6) from the dividend, attach it to 14 and continue: 146 / 15

Let's proceed to step 6:
15 goes into 146 9 times with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 25359.0
Subtract 135 from 146 to get 11.
Fetch the next digit (3) from the dividend, attach it to 11 and continue: 113 / 15

Let's proceed to step 7:
15 goes into 113 7 times with a remainder of 8.
The next digit of our result is 7. 
Result so far: 253597.0
If we take 105 away from 113, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 8:
If we divide 80 by 15, we get 5 and a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 253597.5
Deduct 75 from 80 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 9:
The number 15 fits into 50 3 times, leaving a remainder of 5.
The next digit of our result is 3. 
Result so far: 253597.53
Subtract 45 from 50 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 10:
The number 15 fits into 50 3 times, leaving a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 253597.533
If we take 45 away from 50, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

After the division, we end up with 253597.533 and a remainder of 0.0005.